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ORA

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Basic Info
Addressing Mode Opcode Length Speed
Immediate 09 2 bytes 2 cycles*
Absolute 0D 3 bytes 4 cycles*
Absolute Long 0F 4 bytes 5 cycles*
Direct Page 05 2 bytes 3 cycles*
Direct Page Indirect 12 2 bytes 5 cycles*
Direct Page Indirect Long 07 2 bytes 6 cycles*
Absolute Indexed by X 1D 3 bytes 4 cycles*
Absolute Long Indexed by X 1F 4 bytes 5 cycles*
Absolute Indexed by Y 19 3 bytes 4 cycles*
Direct Page Indexed by X 15 2 bytes 4 cycles*
Direct Page Indexed Indirect by X 01 2 bytes 6 cycles*
Direct Page Indirect Indexed by Y 11 2 bytes 5 cycles*
Direct Page Indirect Long Indexed by Y 17 2 bytes 6 cycles*
Stack Relative 03 2 bytes 4 cycles*
Stack Relative Indirect Indexed by Y 13 2 bytes 7 cycles*
Flags Affected
N V M X D I Z C
. . . . . .

ORA is a 65x instruction that performs a logical OR and stores the disjunction in the accumulator.

Cycle Penalties

See Also

External Links